Definitions of DWG and DXF
DWG (from drawing) is a binary file format used for storing two- and three- dimensional design data and metadata. It is the native format for several CAD packages including AutoCAD and IntelliCAD (and its variants). In addition, DWG is supported non-natively by many other CAD applications.
AutoCAD DXF (Drawing Interchange Format, or Drawing Exchange Format) is a CAD data file format developed by Autodesk for enabling data interoperability between AutoCAD and other programs.
Bi-directional DWG and DXF Conversion
You may convert between DWG and DXF as you wish without AutoCAD.
DWG/DXF File Version Conversion
You may change versions of DWG and DXF both from low to high and from high to low between AutoCAD R9 and Auto CAD 2017.
Complete folders and even subfolders of DWG and DXF files are selectable to convert in one go.